为什么我必须使用int将这些枚举标志值组合在一起？

Question

也许有人可以解释为什么这实际上是一个问题背后的逻辑。

在我的c＃dll中，我有一组通过com api暴露的标志值：

[Flags]
[Guid("~~~")]
[ComVisible(true)]
public enum AssignmentType
{
    None = 0,
    Attendant = 1,
    ConductorCBS = 2,
    ReaderCBS = 4,
    Chairman = 8,
    Mike = 16,
    PlatformAttendant = 32,
    Prayer = 64,
    OCLM = 128,
    Sound = 256,
    Student = 512,
    Custom = 1024,
    Demonstration = 2048,
    Assistant = 4096,
    Host = 8192,
    CoHost = 16384,
    OCLMTreasures = 32768,
    OCLMGems = 65536,
    OCLMLiving = 131072,
    StudentBibleReading = 262144,
    StudentDiscussion = 524288,
    StudentTalk = 1048576
}

在我的C ++ MFC项目中，以下内容如下：

enum __declspec(uuid("~~~"))
AssignmentType
{
    AssignmentType_None = 0,
    AssignmentType_Attendant = 1,
    AssignmentType_ConductorCBS = 2,
    AssignmentType_ReaderCBS = 4,
    AssignmentType_Chairman = 8,
    AssignmentType_Mike = 16,
    AssignmentType_PlatformAttendant = 32,
    AssignmentType_Prayer = 64,
    AssignmentType_OCLM = 128,
    AssignmentType_Sound = 256,
    AssignmentType_Student = 512,
    AssignmentType_Custom = 1024,
    AssignmentType_Demonstration = 2048,
    AssignmentType_Assistant = 4096,
    AssignmentType_Host = 8192,
    AssignmentType_CoHost = 16384,
    AssignmentType_OCLMTreasures = 32768,
    AssignmentType_OCLMGems = 65536,
    AssignmentType_OCLMLiving = 131072,
    AssignmentType_StudentBibleReading = 262144,
    AssignmentType_StudentDiscussion = 524288,
    AssignmentType_StudentTalk = 1048576
};

这是不获取的部分：

int iFlag = MSAToolsLibrary::AssignmentType::AssignmentType_None;
for (int iIndex = 0; iIndex < m_lbAssignmentsOCLM.GetCount(); iIndex++)
{
    if (m_lbAssignmentsOCLM.GetCheck(iIndex) == BST_CHECKED)
    {
        iFlag |= static_cast<MSAToolsLibrary::AssignmentType>(m_lbAssignmentsOCLM.GetItemData(iIndex));;
    }

}
theApp.WriteProfileInt(
    theApp.GetActiveScheduleSection(_T("Options")), _T("SRR_AssignmentsOCLM"), iFlag);

我必须使用int int < /代码> iflag变量。如果我尝试使该变量成为msatoolslibrary :: sistienmentType，则| =行将无法使用。

但是，我 am 能够对API进行类似的呼叫：

const COleDateTime datMeeting = GetMeetingDate(iRow);
auto eTypesToInclude = static_cast<MSAToolsLibrary::AssignmentType>(GetAssignmentsOCLMFlag());
CStringArray aryStrMeetingPersonnel;
theApp.MSAToolsInterface().GetPersonnelForMeeting(
    datMeeting,
    theApp.GetAssignHistoryPathEx(), 
    eTypesToInclude, aryStrMeetingPersonnel);

简而言之，为什么可以将组合的标志值作为msatoolslibrary :: sistientmentType传递给一个函数在API中，但是我必须使用int首先构建编译的标志值。

有意义吗？